Your headset speaks both - so if you could get your headset to only advertise A2DP, the mac would be forced into stereo. It sacrifices sound quality needed to make stereo music sound good.Ī2DP is all about better quality and allowing different encoding schemes to get the best music over a bluetooth link (with potential interference) and sacrifices two way audio, microphone, and adds delay to queue up enough music to allow playing over momentary interference or pauses in bluetooth. HSP was designed for two way, low latency (delay) audio - designed for the limited spectrum telephone lines send for human voice frequencies. In a nutshell, your question is about HSP - the mono headset profile and A2DP - the stereo profile. Since no-one has stepped up with an answer, I'm going to add a few things that may help get you (or someone else) closer to an answer.
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